Emergency alarm system for static structure utilizing automobile horn

Abstract

Alarm circuitry in a static structure, e.g., a home, is connectable by plug and socket means to alarm circuitry in an automobile. The alarm circuitry in the automobile includes a relay powered from a source in the structure. Opening of alarm switches in the structure or on the automobile disables the relay to close a switch in the automobile horn circuit causing the horn to sound. The relay cannot be re-energized except by operation of re-set switch means located in the structure.

What is claimed is: 
     
       1. An alarm system for a static structure comprising an automobile, an audible signal system carried by said automobile, said system including a horn, an automobile battery, a horn switch and circuitry connecting said horn, battery and switch in series whereby closing of said switch energizes said horn to produce an audible signal, in combination therewith a protection circuit comprising a first portion carried by said static structure and including at least one normally closed alarm switch means movable to open position in response to an emergency condition, an electrical power source and circuitry connecting said alarm switch means and said source in series, a second portion carried by said automobile and including a relay coil, relay circuitry including plug and socket means for connecting one terminal of said relay coil to said power source carried by the static structure, a first relay switch connected to said horn circuit in parallel with said horn switch and a second relay switch connected by said plug and socket means in series with said alarm switch means and a second terminal of said relay coil, means biasing said first and second relay switches to a first (respectively, closed and opened) position, and means for simultaneously moving said switches to a second (respectively, opened and closed) position, whereby the opening of said normally closed alarm switch means disconnects said power source from said relay coil, allowing said relay switches to return to their first position, the first said relay switch thereby actuating said horn. 
     
     
       2. The alarm system of claim 1 wherein the means for moving said switches from their first to their second positions comprises means for selectively energizing said relay coil from the power source in said structure. 
     
     
       3. The alarm system of claim 2 wherein said energizing means comprises circuitry which connects, through said plug and socket means, the second terminal of said relay with the power source in said structure, and a re-set switch in said circuitry within said structure and biased at all times to open position but selectively movable momentarily to closed position to energize said relay to effect movement of said relay switches to their second positions. 
     
     
       4. The alarm system of claim 1 wherein the circuitry in said structure includes a plurality of normally closed alarm switch means each movable to an open position in response to a predetermined condition. 
     
     
       5. The alarm system of claim 4 wherein at least one of said alarm switch means is a heat detector switch. 
     
     
       6. The alarm system of claim 4 wherein at least one of said alarm switch means is movable to open position in response to opening of a door, and includes a shunt portion in parallel with said switch means, said shunt portion including a switch selectively closeable to by-pass said last mentioned alarm switch means to enable the opening of said door without energizing said automobile horn. 
     
     
       7. The alarm system of claim 1 wherein said alarm switch means cincludes a normally closed, manually openable switch. 
     
     
       8. The alarm system of claim 1 wherein the second portion of the protection circuit includes a switch normally biased to open position and located so as to be moved to closed position in response to movement of an access member on the automobile to closed position. 
     
     
       9. The alarm system of claim 8 wherein the access member is the hood of the automobile. 
     
     
       10. The alarm system of claim 1, including a manually operable switch on said automobile in series with said first relay switch and said horn, the opening of said switch disabling operation of said horn upon closing of said first relay switch.